Kestner is a German surname and may refer to:
- (Georg Christian) August Kestner (1777, Hanover - 1853), German antiquarian and diplomat
- Kestner-Museum, Hanover, Germany, founded in 1889
- kestnergesellschaft, an art gallery in Hanover, Germany, founded in 1916
- Boyd Kestner (born 1964), American actor
- Charles Kestner (1803 - 1870), German-French chemist and politician
- Charlotte Kestner, nee Buff (1753 - 1828), wife of Johann Christian Kestner
- Hermann Kestner (1810 - 1890), German composer
- Johann Christian Kestner (1741 - 1800), German jurist and archivust
- Lars Kestner, American author of financial texts
- Paul Kestner, founded the Kestner company in 1902, now part of the GEA Group